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Title: EVALUATION OF PLANT ACTIVATORS FOR MANAGEMENT OF FUSARIUM ROOT ROT ON GREEN PEA

Author
item Grunwald, Niklaus - Nik
item Navarre, Duroy - Roy
item Coffman, Virginia

Submitted to: Fungicide and Nematocide Tests
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 2/1/2003
Publication Date: 3/1/2003
Citation: GRUNWALD, N.J., NAVARRE, D.A., COFFMAN, V.A. EVALUATION OF PLANT ACTIVATORS FOR MANAGEMENT OF FUSARIUM ROOT ROT ON GREEN PEA. FUNGICIDE AND NEMATICIDE TESTS. F & N TESTS 58:V001. 2003.

Interpretive Summary: Systemic acquired resistance (SAR) is a natural plant resistance mechanism that is triggered by certain chemical compounds. The SAR inducing compounds Actigard, Messenger and Vacciplant were evaluated for control of Fusarium root rot in pea. A field experiment was conducted in 2002 at the Irrigated Agriculture Research and Extension Center in Prosser, WA. The susceptible cultivar Bolero was used for all treatments. Fusarium root rot developed slowly and continuously in all plots. Disease severity and yields per plant were not significantly different among treatments. Slight treatment effects were seen for the two Vacciplant treatments for root rot index. It appears that the SAR inducing compounds tested do not result in better control of Fusarium root rot or higher yields on processing peas under the experimental conditions used.

Technical Abstract: The SAR inducing compounds Actigard, Messenger and Vacciplant were evaluated for control of fusarium root rot. The experiment was conducted in the Roza root rot nursery located near the Irrigated Agriculture Research and Extension Center (IAREC), WA, where pea had been grown in pea monoculture since 1966 providing natural inoculum of Fusarium solani f. sp. pisi. The soil was plowed 4 Apr 02 following preplant pesticide applications of Prowl (3.3 EC) at 0.75 qt/A, Pursuit (2 EC) at 3 oz/A and Di-Syston (8 E) at 2.5 pt/A. Plots were planted 12 Apr in a randomized complete block design with 4 replications. Commercially treated seed (Captan and Allegiance) of cv. Bolero was planted in plots of 10 ft length × 77 in. width and an approximate density of 9 seed per square ft. Plots were overhead irrigated weekly starting 12 Apr for 3 to 4 hr. SAR inducing compounds were applied with a backpack sprayer. Distilled, deionized water was used for preparation of all treatments. SAR inducing compounds were prepared fresh right before field application. The nontreated control was treated with water. A stand count was conducted on 16 May to express yield as yield per plant. Seed was matured and harvested dry on 19 Jul. Data were analyzed by analysis of variance (SAS, Cary, NC). Fusarium root rot developed slowly and continuously in all plots. Area under disease progress curve (AUDPC) and yields per plant were not significantly different among treatments. Slight treatment effects were seen for the two Vacciplant treatments for root rot index. It appears that the SAR inducing compounds tested do not result in better control of Fusarium root rot or higher yields on processing peas under the experimental conditions used.